Liquids-solids pump



July 27, 1965 l. R. LOSS LIQUIDS-SOLIDS PUMP 2 Sheets-Sheet 1 FiledSept. 27, 1963 IN VENTOR.

lglDOR R. L0 5 cm izz A FIG. 2

AGENT July 27, 1965 1. R. LOSS LIQUIDS-SOLIDS PUMP 2 Sheets-Sheet 2Filed Sept. 27, 1963 INVENTOR. L 05 ISIDOR R.

AGENT United States Patent 3,196,799 LIQUIDS-559M338 PUMP Isidor R.Loss, Phillipsburg, N.J., assignor to Ingersoll- Rand Company, New York,N.Y., a corporation of New Jersey Filed Sept. 27, 1963, Ser. No. 312,0648 Claims. (Cl. 103-107) This invention relates generally to pumps, andmore particularly to pumps for handling solids entrained in liquid.

Pumps of this general type are not new as shown in US. patents, Number2,635,548 granted to C. H. Brawley on April 21, 1952, Number 2,785,930granted to W. R. Burnside on March 29, 1960, and 2,958,293 granted to R.F. Pray, Jr. on November 1, 1960.

It should be understood that pumps for handling solids entrained inliquids are subject to clogging of the'fiow path and impeller.Therefore, such pumps must provide for unrestricted flow of solids to behandled. To accomplish the necessary free flow, the impeller of such apump is normally disposed at the end of the pump chamber opposite acenter inlet. It should be realized that there is a determinable amountof slippage in rotary pumps of this general type which is amplified whenthe impeller is removed from the main pump chamber or the pump chamberflow path.

Accordingly, it is an object of this invention to provide a rotary pumpfor handling solids entrained in liquids that is not readily subject toclogging.

Another object of the present invention is to provide a rotary pump forhandling solids entrained in liquids with means to prevent clogging ofthe impelling means.

Still another object of the present invention is to provide theforegoing type pump with the impelling means removed from the main pumpchamber having an improved output.

And another object of the present invention is to provide the foregoingtype pump that is of relatively simple and rugged construction and isnot subject to malfunction. This invention contemplates a pump forhandling solids entrained in liquids comprising a pair of rotatableimpellers in spaced face to face relationship, a casing enclosing theimpellers and defining a circular pump chamber therebetween on a planetransverse to the axis of rotation of the impellers, said casing havingan outlet coplanar with the chamber and tangential to the pump, and aninlet pipe connected to the casing extending towards the axis of thepump to provide solids entrained in liquid to be pumped.

The foregoing and other objects and advantages will appear more fullyhereinafter from a consideration of the detailed description whichfollows, taken together with the accompanying drawings wherein severalembodiments of the invention are illustrated by Way of example. It is tobe expressly understood, however, that the drawings are for illustrationpurposes only and are not to be construed as defining the limits of theinvention.

FIGURE 1 is an elevational view of a pump made in accordance with thepresent invention,

FIGURE 2 is a sectional view taken on line 2-2 of FIGURE 1, and

FIGURES 3 and 4 are sectional views similar to FIG- URE 2 eachillustrating a modified pump made in accordance with the presentinvention.

Referring now to the drawings, particularly FIGURES 1 and 2, a pump madein accordance with the present invention has a casing providing a pairof axially spaced end walls 11 and 12 connected to each other at theirouter peripheries by an annular wall to define a pump chamber 20. Theend walls 11 and 12 have openings 13 and 1 respectively, that are inaxial alignddfibflfid Patented July 27, 1965 ment. The annular wall 15has a boss face 16 with an inlet opening 17 therethrough that extendsradially relative the pump, and a tangentially disposed outlet neck 18with a flange 19 for connection to a conduit to receive pumped matter. Acover plate 21 is bolted or otherwise connected to wall 11 to close oneend of casing 10 and has a recess to provide, with opening 13, animpeller chamber 22 at the end of pump chamber 20. Cover plate 21 has acentrally disposed cup portion 23 for housing a bearing 24, as will befurther discussed.

A second cover plate 25 is bolted or otherwise connected to wall 12 toclose the other end of casing 10 and is recessed to provide, withopening 14., a second impeller chamber 26 at the other end of pumpchamber 20 from and in axial alinement with impeller chamber 22. Coverplate 25 has a boss 27 with a through bore 28 that is counterbored tohouse a bearing 29, the bore 28 and bearing 29 being in axial alinementwith each other and with bearing 24.

Impellers 30 and 31 are rotatably disposed in spaced face to facerelationship to one another in impeller recesses 22 and 26,respectively, and are connected to a shaft 32 that extends through bore28 and is rotated by a motor 33. Impellers 30 and 31 have hubs supportedin bearings 24 and 29, respectively, while a ring plate 35 is bolted toand cooperates with boss 27 to house a seal 34 against leakage alongshaft 32. It should be understood that bearings 24 and 29 couldrotatably support shaft 32 instead of impeller 30 and 31.

A flanged inlet pipe 36 is connected to the cross face 16 of Wall 15 andextend-s radially inwardly through opening 17 toward the center ofchamber 20 which is a low pressure area when the pump is in operation.Radially disposed pipe 36 may be replaced by an offset pipe 37, as shownin FIGURE 1, which provides inlet fluid to the low pressure area of pumpchamber 20 and in a direction with flow therein. As a furthermodification a combination of inlet pipes 36 and 37 may be provided.Although the inlet opening 17 is angularly offset approximately 270 fromoutlet 18, this angular relationship is for illustration purposes onlyand is not to be construed as defining the limits of the presentinvention.

In operation, solid-s entrained in liquid enter the central low pressurearea of pump chamber 20 through inlet pipe 36 and/ or 37, and is drivenin a circular path around the axis of the pump, which is the axis ofrotation of shaft 32, by the impellers 30 and 31. Centrifugal force dueto the circular flow in chamber 20 urges the liquid and solids towardswall 15, and out of the pump through tangential outlet 18. It should nowbe understood that the material being pumped does not sharply changedirection, and with impelling forces acting on both sides of the flow inchamber 20 provides the pump with improved output efliciency whilemaintaining the aforementioned non-clogging features.

Impellers 30 and 31 are made in the usual manner by providing an annularrecess in the impeller face in which is disposed a series of spacedvanes. Alternately, the impellers may be manufactured by providing anannular series of spaced pockets, the material therebetween acting asvanes. To reduce the tendency of the pockets or spaces between the vanesof the impellers to become clogged by solids carried by the fluid beingpumped, impellers 30 and 31 may be rotated at speeds different from eachother but in the same direction.

To accomplish such diiferential speed, as shown in IGURE 3, a hollowshaft 42 is provided in place of shaft 32 and is connected only toimpeller 31. A second shaft 41 is provided which extends through shaft42 and is connected only to impeller 30. Motor 33, in this instance, isconnected through a conventional gear box 44) to rotate shafts 41 and 42in the same direction and each at a speed diiferent than the other. Tovary or adjust the speed differential of shaft 41 and 42 or impellers3t) and 31, gear ratio changes (not shown) well known in the art may beincorporated in gear box 40.

Another means for rotating impellers 30 and 31 at speeds independent ofeach other is shown in FIGURE 4. In this modification, shaft 32 isconnected to only impeller 31, and cover plate 21 is replaced by a coverplate 25A which corresponds to cover plate 25. Cover plate 25A nowprovides the impeller recess 22 and has a boss 27A for housing a bearing29A that rotatably supports the hub of impeller 30. Boss 27A has a bore28A through which extends a shaft 32A that is connected to only impeller30 and is driven by a motor 33A. A ring 35A is provided to cooperateWith boss 27A to a seal 34A against leakage along shaft 32A. Thus, inthis instance, the rotational speeds 3t) and 31 are individually derivedby independently controlled motors 33A and 33, respectively.

It should now be readily understood that a novel rotary pump withimproved output capabilities is provided for handling solids entrainedin liquids that has desired non-clogging features and impeling means onboth sides of the flowing mass when the pump is in operation.

Although several embodiments of the invention have been illustrated anddescribed in detail, it is to be expressly understood that the inventionis not limited thereto. Various changes may be made in the design andarrangement of the parts Without departing from the spirit and scope ofthe invention as the same will now be understood by those skilled in theart.

I claim:

1. A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end Walls and a peripheralwall joined to the end Walls to define a pump chamber with tangentialdischarge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than thepump chamber and in communication with the pump chamber;

shaft means extending into the pump casing and into the end wallrecesses;

a pair of open faced impellers disposed in spaced faceto-facerelationship each in one of the end wall recesses with its open face inunrestricted communication with the pump chamber and being mounted onthe shaft means for rotation thereby to impel fluid in the chamber forpumping; and

inlet means extending through the peripheral wall into the pump chamberbetween the impellers and terminating adjacent the shaft means forsupplying fluid thereto to be pumped.

2. A rotary pump in accordance with claim 1, and the inlet meanscomprising:

a pipe connected to the peripheral casing Wall which extends inwardlybetween the impellers toward the center of the chamber to provide liquidto be pumped directly to the low pressure area of the chamber; and

the peripheral casing Wall having an opening therethrough for the pipeto permit the pipe to communicate with a source of fluid to be pumped.

3. A rotary pump in accordance with claim 2, and:

the pipe being spaced from the impellers to prevent solids in the liquidbeing pumped from being trapped between the pipe and the impeller faces,and between the pipe and the end Walls.

A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end walls and a peripheralwall joined to the end Walls to define a pump chamber with tangentialdischarge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than thepump chamber and in communication with the pump chamber;

shaft means extending into the pump casing and into the end wallrecesses;

a pair of open faced impellers disposed in spaced faceto-facerelationship each in one of the end wall recesses with its open face inunrestricted communication with the pump chamber and being mounted onthe shaft means for rotation thereby to impel fluid in the chamber forpumping; and

inlet means extending radially into the pump chamber between theimpellers and terminating adjacent the shaft means for supplying fluidto be pumped to the chamber.

5. A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end walls and a peripheralwall joined to the end Walls to define a pump chamber with tangentialdischarge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than thepump chamber and in communication with the pump chamber;

shaft means extending into the pump casing and into the end wallrecesses;

a pair of open faced impellers disposed in spaced faceto-facerelationship each in one of the end wall recesses with its open face inunrestricted communication with the pump chamber and being mounted onthe shaft means for rotation thereby to impel fluid in the chamber forpumping; and

inlet means extending into the pump between the impellers offset from aradial toward the shaft means in the direction of flow in the chamberand terminating adjacent the shaft means for supplying fluid to bepumped to the chamber.

6. A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end walls and a peripheralwall joined to the end Walls to define a pump chamber with tangentialdischarge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than thepump chamber and in communication with the pump chamber;

a shaft extending axially through the chamber into the end wall recessesand outwardly from the casing through one of the end walls;

a pair of open faced impellers mounted in spaced faceto-facerelationship on the shaft for rotation in unison thereby to impel fluidin the chamber for p p e;

each impeller being disposed in one of the end wall recesses and havingits open face in unrestricted communication with the chamber; and

an inlet extending through the peripheral Wall into the pump chamberbetween the impellers and terminatmg adjacent the shaft for supplyingfluid thereto to be pumped.

7. A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end walls and a peripheralwall joined to the end walls to define a pump chamber with tangentialdischarge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than thepump chamber and in communication with the pump chamber;

a pair of shafts each extending through one of the end walls and intothe recess of the wall through which it extends;

a pair of open faced impellers each disposed in one of the end wallrecesses with its open face in unrestricted communication With thechamber and being mounted on the shaft in the same recess for rotationthereby independent of the rotation of the other impeller to impel fluidin the chamber for pumping; and

an inlet extending through the peripheral wall into the pump chamberbetween the impellers and terminating adjacent the shafts for supplyingfluid thereto to be pumped.

8. A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end walls and a peripheralwall joined to the end Walls to define a pump chamber with tangentialdischarge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than thepump chamber and in communication with the pump chamber;

a tubular shaft extending through one of the end walls and into therecess of the wall through which it extends, and another shaft extendingthrough the tubular shaft and the pump chamber into the other end wallrecess;

a pair of open faced impellers each disposed in one of the end wallrecesses with its open face in unrestricted communication with thechamber and being mounted on the shaft in the same recess for rotationthereby independent of the rotation of the other impeller to impel fluidin the chamber for pumping; and

an inlet extending through the peripheral wall into the pump chamberbetween the impellers and terminating adjacent the shafts for supplyingfluid thereto to be pumped.

References Cited by the Examiner UNITED STATES PATENTS 921,118 5/09Kasley 253-77 1,395,464 11/21 Woock 103107 2,635,548 4/53 Brawley l03l032,985,108 5/61 Stoner et al 103-105 X 3,131,877 5/64 Budzien 103--111DONLEY J. STOCKING, Primary Examiner.

HENRY F. RADUAZO, Examiner.

1. A ROTARY PUMP FOR HANDLING SOLIDS ENTRAINED IN LIQUIDS, COMPRISING: APUMP CASING HAVING A PAIR OF AXIALLY SPACED END WALLS AN A PERIPHERALWALL JOINED TO THE END WALLS TO DEFINE A PUMP CHAMBER WITH TANGENTIALDISCHARGE MEANS AT ITS OUTER PERIPHERY FOR PUMPED FLUID; THE END WALLSEACH HAVING A CIRCULAR RECESS OF SMALLER DIAMETER THAN THE PUMP CHAMBERAND IN COMMUNICATION WITH THE PUMP CHAMBER; SHAFT MEANS EXTENDING INTOTHE PUMP CASING AND INTO THE END WALL RECESSES; A PAIR OF OPEN FACEDIMPELLERS DISPOSED IN SPACED FACETO-FACE RELATIONSHIP EACH IN ONE OF THEEND WALL RECESSES WITH ITS OPEN FACE IN UNRESTRICED COMMUNICATION WITHTHE PUMP CHAMBER AND BEING MOUNTED